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Full text of "Metallurgy Of Cast Iron"

THE   MANUFACTURE   AND   PROPERTIES   OF   COKE.
from its pyrites and slate — are caught by perforated iron buckets on an endless chain and carried to a stock pile or to the larries, then to the ovens to be charged for coking. The impurities in the form of slate and iron pyrites which have sunk to the bottom, are passed along through the shutes with outflowing water to the refuse bed. The washing process of ten removes bitumen with the slate to such a degree as to rob the coal greatly of its coking qualities.
The yield of coke obtained 'from ovens generally ranges from sixty to seventy per cent of the coal Charged, whereas "the yield from heaps or mounds does not exceed fifty to fifty-five per cent. The long mounds are said to be productive of better coke and furnish a larger yield than round or small oblong piles having one center draft provision. The following table No. i shows the yield of a few grades of Connells-ville coke in ovens prepared by Mr. John Fulton, and published in the American Manufacturer of February 10, 1893:
TABLE I.—YIELD OF COKE FROM COAL.
^					<u o	<u	Per cent, of yield.				1
$ o	a . "H C (U CD	So — rt	•8 cd 2	8<u -o	0 S-S	o . ^"S		aJ	2s	<u	8
• 6	£5		to	5 S	J3S	o S	'5'	.28	« 8	o 8	•fc '
fc	H	a		to	S		<		s	H	s
	h. m.	lb.	lb.	lb.	lb.	lb.					
i 2	67   oo 68   oo	12,420 11,090	99 90	385 359	7,5i8 6,580	7,903 6,939	00.80 00.81	3.24	59-33	63-63 62.57	35-57 36.62
3	45   oo	9,120	77	272	54i»	5,690	00.84	2.98	59-41	62.39	36.77
4	45   0°	9,020	74	349	5-334	5,683	00.82	3-H7	59-13	63.00	36-18
		41,650	340	1,365	24,850	26,215	00.82	3-28	59-66	62.94	36.24
The question of density in coke is largely one of cell space, which can vary greatly in hard as well as in soft grades of coke. Oven coke is generally consideredm boat, car, or crushers                 r,